Improvement in the giffard injector



stent (Milice.

JAMES GRESHAM, OF MANCHESTER, ENGLAND.

Letters Patent No. 101,858,1ated April 12, 1870.

. IMPROVEMENT IN THE G-IFFARD .INJECTOR The Schedule referred to in these Lettera Patent and making part of the same.

To all whom it 'may concern Be it known that I, JAMEs GREsnA-M, of the city of' Manchester, in the county of Lancaster, England, have invented a new and useful Improvement in the Giard Injector, of which Jthe followingis a full, clear,

' and exact description, reference being had to the acattached, so that, by turning the spindle, a double adjustment is obtained, that is, the steam-nozzle will be ade to move in one direction to` shut or reduce the water-space, and the` cone-spindle will be made to move in the opposite direction to open or increase the stealn-space, or rice corsa.

By this improvement the most perfect and expeditious adjustment of the steam and water-spaces relativel y to each other, may be edecte'd by the working or turning of a single handle, with or under a re` duced travel of the ram, which diminishes the play of the joint or flexible attachment that unites the ram with the pipe that conveys steamhto it.

'Referring to the accompanying` drawiugf a represents the body part of the injector, iu which the combining and receiving-cones al and aP' and the branch c for the water-pipe are formed.

b is the central cone-spindle, rotated by a handle, b.

c, the steam-nozzle.

d, the ram in which the steanl-uozzle c is secured.

l1 is the branch for the steam-pipe.

rlhe ram d, to which the steam-nozzle c is secured, moves in and out of the .body part a of the injector through astuing-box a, and the cone-spindle bpasses through a stuing-box, d2, in the end of the ram ll.

The cone-spindle b has two screws formed upon it, one, b2, of which fits athread upon the interior ofthe ram d, and the other, b, screws through a fixed box, collar, or plate, b4, which maybe carried by pillars from the body part of the injector, and notches may be cut out of the flanges of' thc ram to slide upon the pillars,

to prevent the rain from turning when the screw is rotated.

The interior screw b2 has one or more spaces s cut out or down through it, to allow the steam to pass.

The direction of' the two screws b2 and b3 upon the spindle b is the same, that is, both are either right or both left-handed threads, but the interior screw 11" is ot' greater pitch than the exterior screw b,- the ratio preferabl y being about five to three, the interior screw being five and the exterior screw three.

The spindle b has a valve or valve-surface, b, upon it, which valve ts against a seating` upon the steamnozzle, so that the steam can be perfectly shut ofi' by the central spindle. The steam branch all is connected with a flexible or jointed pipe which will allow of the required movedescribed) the one within the ram (l, and the other through the fixed collar or plate b4, the turning ofthe conc-spindle b through the handle b effects a double or reverse adj ustn'ient, the one of the conical portion of the spindle b, and the other ofthe steam-nozzle c, to vary or adjust the steam and water-spaces above the combining and receiving-cones 01a, to secure a proper working of the injector.

Both the ram d and cone-spindle b being thus ref verscly and simultaneously operated, said adjustment is necessarilyeff'ectcd in a most expeditious manner, and, to cect a given amount ot' adjustment, the ram d is required to. move through a much less space than if the cone-spindle were stationary and the ram only moved.

rlhis reduction in travel of the ram diminishes the strain upon or play of the joint or exibleconncction which unites the branch dl with the steam-pipe.-

What is here claimed, and desired to be secured by Letters Patent, is-

'lhe combination of' the two screws vo upon the cone-spindle b, for opcration,'the one 4in connection with the ram, and the other through a stationary box or'platc, substantially as specified.

' JAMES GRESHAM.

Witnesses:

W. H. DEAN, .l. GnAvnN. 

